Question

Name the repeating components of each DNA strand lengthwise.

Answer 1

Nucleotides are the repeating components of each DNA.
Each nucleotide consists of one molecule each of sugar (pentose), phosphate and nitrogen base.
The sugar and phosphate molecules are alternately arranged one above another. The nitrogen base is attached to the pentose sugar and is oriented inward. Each nitrogen base is joined with the nitrogen base of the complementary strand with a hydrogen bond. Adenine pairs up with thymine (two hydrogen bonds), while guanine pairs up with cytosine (three hydrogen bonds).